There is general agreement that ramps were used, but still much debate on if ramps that went around the pyramid or one big one. The use of one big one does not seem very practical--it would become more than a mile long as the pyramid was constructed!
The material used in the building of the ramp is generally thought to be the gravel and small stones from the excavating of the blocks for the pyramid. In fact, a partial ramp is still in situ in Karnak, at the base of one of the pylons.
As with many aspects of the Egyptian civilization, just exactly how the pyramids were constructed is still debated.

The ramps that wrap around the pyramid is the most logical idea for me. They are neither too steep or too long. The length has to be no more than enough to give a good "start" to hauling the stones up the pyramid, and the steepness can be controlled by the pitch and number of ramps around the building.
The use of large stones in the construction of the ramps is not feasible, IMHO. There would be too much time and effort in building and removing the ramps. If they were built of gravel/sand/small stones, it would be much easier to do both, and therefore use much less time.

I would have thought that a stone that cold be moved by 1 or 2 men would take less time to handle than small stuff - remember they would have had wooden shovels which I would imagine are less easy to use than metal.
I am not talking about the quality of work you get in even the core of the great pyramid.

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